Speedometer driving mechanism.



UNITED STATES PATENT oEEIoE.

JOHN G. PERRIN, OF DETROIT, MICHIG OF DETROIT, MICHIGAN.

AN, ASSIGNOR T0 MOTOR PATENTS COMPANY,

A CORPORATION OF MICHIGAN.

SPEEDOMETER DRIVING MECHNISM.

To all whom 'it may concern: Y

Be it known that l. Joux' (i. PERRIN, a citizen ot the Fnited States, residing at Detroit. in the county ot ll-'ayne and State et Michigan, have invented certain new and usetul Improvements in Speedoineter 'Driving Mechanism, ot which the following is a specification.

My invention relates to means tor driving a speedometer or other device or apparatus trom the hub ot a vehicle wheel and the primary object ot the invention is to provide means whereby the hub ot the wheel may bc provided with a driving member that aetuates a driven member mounted within a casing adjacent to the wheel hub.

A further' object ot the invention is to provide a mechanism arranged on the rear portion of the hub adjacent to the steering knuckle, Without cutting away or otherwise weakening the steering knuckle or the axle spindle.

A further object ot the invention is to provide a compact mechanism for actuating a speedometer or other apparatus which can be quickly assembled, which is readily accessible, and which may be entirel)v inelosed so as to protect the meshing parts.

The various other objects ot my invention will be more 'fully set forth in the following description of one form of mechanism embodying my invention which censists in the new and novel features of construction and combination of parts hereinatter set `forth and claimed.

In the accompanying drawings Figure 1 represents a side elevation, partly in section of a portion. of a wheel mounted upon lthe steering knuckle embodying my improved speedometer driving mechanism.

Fig. 2 represents a detail horizontal'scction on the lines QMS ot Fig. l.

The wheel o may he, of any desired construction and is mounted upon the spindle I; preferably formed integral with the knuckle c which is supported by the voke o7 in an v well known or preferable manner. Suitable anti-friction bearings e may be provided between the wheel and the axle it desired.

The rear portion ot the hub f adjacent. to the steering knuckle is provided with an annular flange g. A rearwardly projecting toothed ring or annular gear L is secured to said flange g in any suitable manner as by the screws A fixed member preferably Specification of Letters Patent.

Application tiled August 3, 1912.

,ner as by the screws Patented Mar. 20, 1917.

serial No. 713.168.

comprising' a protecting cap iS Secured t0 the steering knuckle c in any suitable manand is formed with an annular flange provided with a packing ring Z that engages the exterior of the gear z.. packing p is positioned between the hub and spindle to prevent dust trom working into the gears along the spindle. Said member is provided with a bearing 'in for a shatt ny having a spur gear amounted thereon which meshes with the gear 7L. rlhe said shat't may be connected in any suitable or well known manner with a speedometer or other driven mechanism.

l'n operation. the rotation ol' the hub is directly transmitted to the spindle ynvv through the gears l1. and n. Consequently, lost m0- tion is reduced to a minimum and an accurate register can be obtained. To disassemble the parts, the wheel a is removed, which permits access to or removal of the gear It and ot the cap j, together with the spur gear 0. When the Wheel is replaced upon the spindle, the gears L and 0 -are brought into mesh without adjustment or securing means ot any kind. The Wheel can be removed from the spindle without disturbing the driven pinion in any Way.

By means ot this construction, the driving gear is secured to the rear ot and has approximately the maximum diameter of the hub. thus permitting greater accuracy in the cutting of the gear teeth. This arrangement also permits the relation of the gearing to the operation ol" the speedometer or other registering device to be readily determined by the diameter of the wheel, thus permitting suitable increase or decrease in the driving gear in proportion to the size or diameter of the wheel without changing the size ot the driven pinion. r1`he gearsl and working parts are completely inelosed and are so located as to be practically tree Vtrom accidental injury or displacement.

Athough l have shown my improved construction used with a straight spindle, it is obvious that the same can be used with an ull-set or inclined lspindle. it desired, and that various changesl and modifications may be made in the particular mechanism lerein shown and described, provided the means set forth in the following claim be emdoyed.

l claim as mv invention :J-

A demountable unit adapted tovconstitute elose one open side ofthe ring, the other element heing a flat cap having a peripheral flange teleseopnig sani ringand in dnsttight sliding engagement therewith, means vmember meshing with the teeth of the ring.

for mounting' said cap, said Cap coaeting with saill mounting to ehse the other open side el the ring, and a shaft hearing ear- 1e(l hy said cap and adapted to support a l This specification signed and witnessed thisI 31st lay ot July, A. D., 1912.

, JOHN G. PERRIN. Signed in the presenee 0f:- F. C. CHANDLER, O. E. DISTIN. 

